diff --git a/packages/effect-fc/src/Lens.ts b/packages/effect-fc/src/Lens.ts
index 45779eb..155adfd 100644
--- a/packages/effect-fc/src/Lens.ts
+++ b/packages/effect-fc/src/Lens.ts
@@ -1,4 +1,4 @@
-import { Chunk, Effect, Pipeable, Predicate, Readable, Stream, Subscribable, SubscriptionRef } from "effect"
+import { Chunk, Effect, Pipeable, Predicate, Readable, Ref, Stream, Subscribable, SubscriptionRef } from "effect"
 
 
 export const LensTypeId: unique symbol = Symbol.for("@effect-fc/Lens/Lens")
@@ -124,6 +124,8 @@ Effect.gen(function*() {
 
     console.log(yield* myChunkRef.get)
     console.log(yield* chunkValueLens.get)
+    yield* Ref.update(myChunkRef, Chunk.replace(1, 22))
+    console.log(yield* chunkValueLens.get)
 }).pipe(
     Effect.runSync
 )